Through the test of friction loss of pipe with 6 kinds of prestressed reinforcement for 32m simply supported box girder of Yanmiao bridge of Wuhan-Guangzhou passenger special line,the least square method was used for the analysis,and friction coefficient between prestressed steel rope and pipe wall and pipe deviation coefficient were obtained.

A study of the layout of pre-stressing tendon and the formula for calculating area used in checking local compression bearing capacity

The processing of T-beam prestress tendon and stretching construction technology;

The paper analysed the calculating of extension value when prestress tendon was tensioned and introduced the usage of practical measuring results of extension value by construction experience.